CN202983501U - Vortex type denitration injector of circulating fluidized bed - Google Patents
Vortex type denitration injector of circulating fluidized bed Download PDFInfo
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- CN202983501U CN202983501U CN 201220673449 CN201220673449U CN202983501U CN 202983501 U CN202983501 U CN 202983501U CN 201220673449 CN201220673449 CN 201220673449 CN 201220673449 U CN201220673449 U CN 201220673449U CN 202983501 U CN202983501 U CN 202983501U
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- urea water
- fluidized bed
- air hose
- shower nozzle
- eddy current
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Abstract
The utility model relates to a vortex type denitration injector of a circulating fluidized bed. The vortex type denitration injector comprises a gun body component and a nozzle component, wherein the nozzle component comprises a spray head, a swirler and a blending device connected with the spray head, wherein an outlet end of the blending device is located in the spray head and forms a mixing chamber with the spray head; the blending device comprises a urea water channel located at the center and at least four air channels; the air channels and the urea water channel are arranged on different planes; and multiple air channels are obliquely tangential to the same circumference. According to the denitration injector provided by the utility model, a separation-structure composite atomization nozzle is adopted, a swirler auxiliary atomization mode is creatively added to pneumatic atomization, and the atomization taper angle is expanded; and meanwhile, the mixing area is increased, secondary reinforced mixing and controllability of the spray field structure are realized, the mixing and covering degree of the spray field and the smoke can be effectively improved, and the denitration efficiency is improved.
Description
Technical field
The utility model relates to the flue gas wet denitration core apparatus of station boiler, and particularly a kind of recirculating fluidized bed eddy current type denitration injector, can be applicable to the circulating fluidized bed combustion coal boiler, carries out NOx and controls processing.
Background technology
Can be to a large amount of pollutants of environmental emission when the boiler combustion coal dust carries out power conversion, in atmosphere NOx discharging 67% comes spontaneous combustion coal according to statistics, the discharging of nitrogen oxide (NOx) is the one of the main reasons that causes a series of severe contamination problems such as acid rain, photochemical fog, therefore coal-fired boiler in power plant is carried out NOx control processing and is necessary very much.Gas denitrifying technology began to use in Japan 20 century 70 mid-terms, the end of the eighties, European Union member countries also began the commercial Application of gas denitrifying technology, the U.S. begins to use gas denitrifying technology the beginning of the nineties, the total installation of generating capacity of whole world coal-fired plant flue gas denitrating technique has surpassed 2GW at present, and less in the installed capacity of China.High efficiency heavy-duty generator group speedup was very fast in recent years, and had mostly adopted comparatively advanced low nitrogen burning technology, and the NOx emission level of the unit's of making generated energy is on a declining curve; In addition, the building up and putting into operation of the low nitrogen burning technological transformation of in-service unit and a part of new power plant construction equipment for denitrifying flue gas, also play a role to reducing the NOx emission level, but from whole industry, China still is in the starting stage to the control of discharged nitrous oxides, be difficult to satisfy environmental requirement, very large development potentiality is arranged.
Flue gas wet denitration technology is a kind of low cost, NOx controls treatment technology efficiently, and its cardinal principle is not have under catalyst action, sprays aqueous solution of urea as reducing agent in 870～1150 ° of C high-temperature flue gas, and in reducing agent and flue gas, the NOx reaction generates N
2Thereby, complete the control of NOx.The circulating fluidized bed boiler separator inlet temperature generally between 870 ~ 950 ℃, adopts suitable wet denitration technology, the NOx concentration of emission can be reduced to below 100ppm, satisfies national up-to-date discharge standard.Principle by the flue gas wet denitration as can be known, the urea water spray field reaches and the mixed process of flue gas has material impact to denitration efficiency, and the atomizing particle size of aqueous solution of urea distributes, flows the key parameter that strong spatial distribution, atomization angle, jet velocity etc. are impact spraying and mixing.Simultaneously due to recirculating fluidized bed separator inlet flow of flue gas narrow space, heating surface complexity, often need several eddy current type denitration injectors to carry out combined jet, it is regional that the spray field combination of fixed angle and penetration depth is difficult to cover most flow of flue gas, solution is realize spray field penetration depth and spray angle adjustable flexibly, improves the coverage rate of urea water spray field.Eddy current type denitration injector is for a long time in the work of recirculating fluidized bed separator inlet, and work under bad environment, its thermal protection and long-play reliability need to consider.Therefore, the thermal protection ability of the structural design of the atomization characteristics of nozzle, rifle body, rifle body and long-play reliability are the key technologies of eddy current type denitration injector designs.In order to improve denitration efficiency, need the choose reasonable nozzle arrangements and mate atomization parameter, optimize the structural design of rifle body, finally improve the Performance And Reliability of spray gun.
As seen from the above analysis, the flue gas wet denitration is the new technology that the development and application potentiality are arranged very much, and eddy current type denitration injector forms product as its core and also has a good application prospect.Under the situation that environmental requirement improves day by day, the development of this product and application have good economic and social benefit.
Summary of the invention
In order to improve denitration efficiency, the utility model provides a kind of recirculating fluidized bed eddy current type denitration injector, can operation steady in a long-term carry out in the flue gas environment of high temperature (950 ℃), the high wearing and tearing of high burn into, finally carries out flue gas NOx control and processes.
Technical solution of the present utility model is:
Recirculating fluidized bed eddy current type denitration injector comprises rifle body assembly and nozzle assembly,
Described rifle body assembly comprises conduit assembly and input module,
Described conduit assembly comprises air hose and is socketed in urea tube on air hose, forms the urea water ring cavity between described air hose and urea tube,
Described input module comprises the pneumatic fitting that is arranged on air hose one end, the urea water joint that is communicated with the urea water ring cavity and commutation head, described air hose all is connected with an end of commutation head with the other end of urea tube, the other end of described commutation head communicates with nozzle assembly, and its special character is:
described nozzle assembly comprises shower nozzle, swirler and the blending device that is connected with shower nozzle, the port of export of described blending device is positioned at shower nozzle and forms mixing chamber with shower nozzle, described blending device comprises urea water passage and at least four air ducts that are positioned at the center, described air duct and urea water passage antarafacial arrange, a plurality of air ducts same circumference of cutting sth. askew, described swirler is arranged between mixing chamber and shower nozzle, the arrival end of described mixing chamber communicates with urea water passage and air duct, described urea water passage and urea tube communicate, described air duct and air hose communicate, the port of export of described mixing chamber is communicated with shower nozzle by swirler.
Above-mentioned commutation head comprises base, is arranged on interior flow guide sleeve and outer flow guide sleeve on base with one heart, described base is provided with scavenge duct along the base bearing of trend, be provided with perpendicular to the base bearing of trend and change the liquid passage, described air hose is communicated with the entrance of scavenge duct, described urea water ring cavity with change the liquid feeder connection and be communicated with, the outlet of described scavenge duct is communicated with air duct by outer flow guide sleeve, describedly changes the outlet of liquid passage by interior flow guide sleeve and urea water channel connection.
Above-mentioned rifle body assembly also comprises adjusting part, described adjusting part comprises front closure plate, rear blocking plate, is enclosed within the outer concetrated pipe of air hose, one end of described concetrated pipe is fixed on air hose by rear blocking plate, the other end of described concetrated pipe is fixed on urea tube by front closure plate, formation set ring cavity between described concetrated pipe and air hose, described set ring cavity is communicated with the urea water ring cavity, and described urea water joint is arranged on concetrated pipe, and the outlet of described urea water joint is communicated with the set ring cavity.
Above-mentioned shower nozzle comprises spout and channelization angle, described channelization angle and spout connection.
Above-mentioned spout is fan-shaped spout, exports to be the olive-type structure.
Shower nozzle has 30 °, 60 ° and 100 ° of three kinds of patterns.
Above-mentioned rifle body material adopts alloy 316L, and the material of described adjusting part, pneumatic fitting (9) and urea water joint (10) is stainless steel 321.
The front end outer surface of the lateral surface of said nozzle assembly and rifle body assembly is coated with the heat resistant and wear resistant protective finish.
The utility model beneficial effect compared with prior art is:
1, denitration injector of the present utility model adopts the compound atomizing jet of isolating construction, the creationary swirler assisted atomization mode that increased on the basis of pneumatic nebulization, enlarge the atomizing cone angle, increase simultaneously mixed area, realized that secondary hardening mixes and the controllability of spray field structure, can effectively improve mixing and level of coverage of spray field and flue gas, improve denitration efficiency.
2, the utility model has adopted swirler, and with the mixing chamber Proper Match, realize to enlarge the atomizing cone angle, increase simultaneously the effect of flue gas mixed area, overcome the technology prejudice of this area.Those skilled in the art due to the separating effect of swirler self, must not can select swirler when facing the technical problem that enlarges cone angle, increase mixed area.
3, the utility model by the self-cooling structure of design urea water, has reduced the complexity of lance body structure on the one hand, has reduced rifle body size, and the opposing party has guaranteed the reliably cooling of rifle body.
4, the utility model adopts the structure that shower nozzle separates with the blending device, only just can adjust spray angle, liquid-drop diameter spatial distribution and the penetration depth of hollow cone spray field by changing shower nozzle and swirler, the various separator inlet structures of flexible adaptation have very strong system compatibility.
5, the utility model provides eddy current type denitration injector, can long-term work under 950 ℃ of hot environments, and the limit of working temperature can reach 1250 ℃, has greatly increased the compatibility of spray gun and hot environment.
6, eddy current type denitration injector of the present utility model can long-term stable operation in the flue gas environment of high temperature, the high wearing and tearing of high burn into.
7, the front end outer surface of the lateral surface of nozzle assembly and rifle body assembly is coated with the heat resistant and wear resistant protective finish, can effectively prevent corrosion and the wearing and tearing of ciculation fluidized height of bed cloud of dust gas.
8, spray angle 30 ~ 100 is adjustable continuously, and spray field drop SMD is less than 100 μ m.
Description of drawings
Fig. 1 is eddy current type denitration emitter construction schematic diagram of the present utility model;
Fig. 2 is the structural representation of nozzle assembly of the present utility model;
Fig. 3 is the structural representation of commutation head of the present utility model;
Fig. 4 is the A-A view of Fig. 3;
Wherein Reference numeral is: 1-rear blocking plate, closure plate before 2-concetrated pipe, 3-, 4-air hose, 5-urea tube, the 6-head that commutates, 7-nozzle, the 8-sealing gasket that commutates, the 9-pneumatic fitting, 10-urea water joint, 11-blending device, 12-sealing gasket, 13-swirler, the 14-shower nozzle, 15-mixing chamber, 16-urea water passage, 17-air duct, 18-gathers ring cavity, 45-urea water ring cavity, 61-base, 62-flow guide sleeve, 63-scavenge duct, 64-change the liquid passage, flow guide sleeve in 65-, 19-channelization angle.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail: Fig. 1 is eddy current type denitration emitter construction figure of the present utility model, comprise rifle body assembly and nozzle assembly, described rifle body assembly comprises conduit assembly and input module, described conduit assembly comprises air hose 4 and is socketed in urea tube 5 on air hose 4, form urea water ring cavity 45 between air hose 4 and urea tube 5
Input module comprises the pneumatic fitting 9 that is arranged on air hose 4 one ends, the urea water joint 10 that is communicated with urea water ring cavity 45 and commutation 6, the other end of described air hose 4 and urea tube 5 all is connected with an end of commutation 6, the other end of commutation 6 communicates with nozzle assembly
nozzle assembly 7 comprises shower nozzle 14, swirler 13 and the blending device 11 that is connected with shower nozzle 14, one end of described blending device 11 is positioned at shower nozzle 14 and forms mixing chamber 15 with shower nozzle 14, blending device 11 comprises urea water passage 16 and at least four air ducts 17 that are positioned at the center, air duct 17 and the 16 antarafacial settings of urea water passage, a plurality of air ducts 17 same circumference of cutting sth. askew, swirler 13 is arranged between mixing chamber 15 and shower nozzle 14, one end of mixing chamber 15 communicates with urea water passage 16 and air duct 17, the other end of described mixing chamber 15 is communicated with shower nozzle 14 by swirler 13.
Commutation 6 comprises base 61, is arranged on interior flow guide sleeve 65 and outer flow guide sleeve 62 on base with one heart, described base 61 is provided with scavenge duct 63 along the base bearing of trend, be provided with perpendicular to the base bearing of trend and change liquid passage 64, described air hose is communicated with the entrance of scavenge duct, described urea water ring cavity with change the liquid feeder connection and be communicated with, the outlet of described scavenge duct is communicated with air duct by outer flow guide sleeve 62, describedly changes the outlet of liquid passage by interior flow guide sleeve 65 and urea water channel connection.
Rifle body assembly also comprises adjusting part, described adjusting part comprises rear blocking plate 1, concetrated pipe 2 and front closure plate 3, one end of concetrated pipe is fixed on air hose by rear blocking plate, the other end of described concetrated pipe is fixed on urea tube by front closure plate, formation set ring cavity 18 between described concetrated pipe and air hose, set ring cavity 18 is communicated with urea water ring cavity 45, and described urea water joint 10 is arranged on concetrated pipe 2, and the outlet of urea water joint 10 is communicated with set ring cavity 18.
Nozzle assembly 7 adopts internal-mixing air swirl structure, and shower nozzle and swirler can distribute according to flue gas flow field and be configured.
During the work of eddy current type denitration injector, aqueous solution of urea is fed to outside ring cavity by urea water joint 10, enters the nozzle mixing chamber after the commutation of commutation head; Compressed air enters air chamber by pneumatic fitting 9, enters the nozzle mixing chamber along circumferential spray orifice after commutation head, and aqueous solution of urea and atomizing air be at the interior collisional mixing of nozzle 7, forms to satisfy the spray field that penetration depth and particle diameter distribute and require after the shower nozzle ejection.
As shown in Figure 2, nozzle of the present utility model is the compound atomizing jet with isolating construction, is comprised of prepass 11, sealing gasket 12, swirler 13 and shower nozzle 14.Wherein shower nozzle connects by female thread structure with prepass, and mixing chamber outlet is positioned at shower nozzle inside, can adjust by changing shower nozzle and swirler the penetration depth of single-nozzle, angle and the particle diameter of hollow cone spray field distributes.
Adopt eddy current type denitration injector of the present utility model to be successfully applied to two, certain power plant 300MW circulating fluidized bed combustion coal unit, the denitrating flue gas rate surpasses 65%, the product stable and reliable operation.
The foregoing description of present embodiment and accompanying drawing have represented preferred version of the present utility model, concrete enforcement can be carried out according to cyclone separator arrangement and design parameter improvement and the replacing of rifle body and nozzle within not departing from the scope that the utility model claim defines, therefore, the utility model is widely.
The eddy current type denitration injector that provides comprises rifle body and nozzle, and nozzle structure can be adjusted according to separator inlet.Designs of nozzles becomes internal-mixing swirling flow atomizing structure, outlet is provided with channelization angle, adopt the mode of air-assisted atomization to reduce the atomized drop diameter, adopt cyclone mode to strengthen spray field and flue gas mixability, fully mix and extend the time of staying with flue gas to reach reducing agent.The rifle body adopts the urea water self-cooling structure, and aqueous solution of urea enters the rifle body from the outside, flows along ring cavity, flowed out by nozzle after the commutation of rifle head, by appropriate design ring cavity structure, guaranteed the reliably cooling of rifle body on the one hand, guaranteed on the other hand the controllability of urea water temperature rise to atomizing effect.Rifle body front end outer wall spraying heat resistant and wear resistant coating can effectively be prevented corrosion of fume and wearing and tearing, extends product service life and improves reliability.
According to eddy current type denitration injector of the present utility model, described nozzle adopts isolating construction, and it is characterized in that: shower nozzle and swirler structure are fully independent, can by synchronous shower nozzle and the swirler adjusted, realize the control to gas-liquid mixed intensity and spray field structure; Can adjust jet expansion speed and penetration depth by adjusting mixing chamber outlet; By adjusting spout and channelization angle thereof, the stream that can adjust flexibly spray field is strong to distribute and spatial distribution.Described nozzle is in the situation that the needs that the combination of separator inlet spray field distributes can be effectively satisfied in the adjustment that can realize the spray field penetration depth, flow the atomization characteristics such as strong distribution and spatial distribution by only changing shower nozzle and swirler.
According to eddy current type denitration injector of the present utility model, described nozzle is comprised of prepass, sealing gasket, swirler and shower nozzle, nozzle body is the internal-mixing structure, and aqueous solution of urea is entered by central passage, and air is rotated into by 4 spray orifices that circumferentially are 90 ° of angles.The shower nozzle import is provided with rectifier tank, air and aqueous solution of urea begin mutual impingement mix at the rum point of mixing chamber, strong energy exchange and momentum-exchange occur, form uniform blister two phase flow, gas-liquid mixed stream is restricted and crimp in swirler flute profile passage, finally form hollow cone spray field structure through the spout expansion, the rectifier tank of nozzle is conducive to the further expansion of gas-liquid mixed stream and the expansion of spray field.The different requirements that distribute strong according to spray flow, shower nozzle and swirler structure can be adjusted flexibly, to satisfy the requirement of recirculating fluidized bed flue-gas denitration process.
According to eddy current type denitration injector of the present utility model, urea water flow 0.10～0.40t/h, its mobile in the external side ring of rifle chamber has from cooling effect, and the rifle body can long-term reliable and stable operation in 950 ℃ of environment.The nozzle that uses is entering implication, liquid road pressure 0.4～0.6Mpa, and when aqueous solution of urea flow 70.0g/s, gas liquid ratio 2.0%～2.5%, the spray field penetration depth surpasses 4.0m, and average Suo Taier diameter is less than 100 μ m.
The know-why that the utility model is taked: eddy current type denitration injector adopts the urea water self-cooling structure, effectively guarantees the cooling effect of rifle body under hot environment; Nozzle has adopted the compound atomizing jet with isolating construction, when satisfying the atomizing requirement, has realized the controllability of penetration depth and spray field structure; Select suitable material, in rifle surface spraying heat resistant and wear resistant coating, improved corrosion resistance and the wearability of product.
Claims (8)
1. recirculating fluidized bed eddy current type denitration injector, comprise rifle body assembly and nozzle assembly,
Described rifle body assembly comprises conduit assembly and input module,
Described conduit assembly comprises air hose (4) and is socketed in urea tube (5) on air hose (4), forms urea water ring cavity (45) between described air hose (4) and urea tube (5),
Described input module comprises the pneumatic fitting (9) that is arranged on air hose (4) one ends, the urea water joint (10) that is communicated with urea water ring cavity (45) and commutation head (6), described air hose (4) all is connected with an end of commutation head (6) with the other end of urea tube (5), the other end of described commutation head (6) communicates with nozzle assembly
It is characterized in that:
described nozzle assembly (7) comprises shower nozzle (14), swirler (13) and the blending device (11) that is connected with shower nozzle (14), the port of export of described blending device (11) is positioned at shower nozzle (14) and forms mixing chamber (15) with shower nozzle (14), described blending device (11) comprises urea water passage (16) and at least four air ducts (17) that are positioned at the center, described air duct (17) and urea water passage (16) antarafacial setting, a plurality of air ducts (17) same circumference of cutting sth. askew, described swirler (13) is arranged between mixing chamber (15) and shower nozzle (14), the arrival end of described mixing chamber (15) communicates with urea water passage (16) and air duct (17), described urea water passage (16) and urea tube (5) communicate, described air duct (17) and air hose (4) communicate, the port of export of described mixing chamber (15) is communicated with shower nozzle (14) by swirler (13).
2. recirculating fluidized bed eddy current type denitration injector according to claim 1, it is characterized in that: described commutation head (6) comprises base (61), be arranged on one heart interior flow guide sleeve (65) and outer flow guide sleeve (62) on base, described base (61) is provided with scavenge duct (63) along the base bearing of trend, be provided with perpendicular to the base bearing of trend and change liquid passage (64), described air hose is communicated with the entrance of scavenge duct, described urea water ring cavity with change the liquid feeder connection and be communicated with, the outlet of described scavenge duct is communicated with air duct by outer flow guide sleeve (62), described outlet of changing the liquid passage is by interior flow guide sleeve (65) and urea water channel connection.
3. recirculating fluidized bed eddy current type denitration injector according to claim 1 and 2, it is characterized in that: described rifle body assembly also comprises adjusting part, described adjusting part comprises front closure plate (3), rear blocking plate (1), be enclosed within the outer concetrated pipe (2) of air hose, one end of described concetrated pipe is fixed on air hose by rear blocking plate, the other end of described concetrated pipe is fixed on urea tube by front closure plate, formation set ring cavity (18) between described concetrated pipe and air hose, described set ring cavity (18) is communicated with urea water ring cavity (45), described urea water joint (10) is arranged on concetrated pipe (2), the outlet of described urea water joint (10) is communicated with set ring cavity (18).
4. recirculating fluidized bed eddy current type denitration injector according to claim 3, it is characterized in that: described shower nozzle comprises spout and channelization angle (19), described channelization angle (19) and spout connection.
5. recirculating fluidized bed eddy current type denitration injector according to claim 4, it is characterized in that: described spout is fan-shaped spout, exports to be the olive-type structure.
6. recirculating fluidized bed eddy current type denitration injector according to claim 5, it is characterized in that: shower nozzle has 30 °, 60 ° and 100 ° of three kinds of patterns.
7. recirculating fluidized bed eddy current type denitration injector according to claim 6 is characterized in that: described rifle body material adopts alloy 316L, and the material of described adjusting part, pneumatic fitting (9) and urea water joint (10) is stainless steel 321.
8. recirculating fluidized bed eddy current type denitration injector according to claim 7, it is characterized in that: the front end outer surface of the lateral surface of described nozzle assembly and rifle body assembly is coated with the heat resistant and wear resistant protective finish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201220673449 CN202983501U (en) | 2012-12-08 | 2012-12-08 | Vortex type denitration injector of circulating fluidized bed |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220673449 CN202983501U (en) | 2012-12-08 | 2012-12-08 | Vortex type denitration injector of circulating fluidized bed |
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| CN202983501U true CN202983501U (en) | 2013-06-12 |
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| CN 201220673449 Expired - Lifetime CN202983501U (en) | 2012-12-08 | 2012-12-08 | Vortex type denitration injector of circulating fluidized bed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103007724A (en) * | 2012-12-08 | 2013-04-03 | 中国航天科技集团公司第六研究院第十一研究所 | Swirl type denitration ejector of circulating fluidized bed |
-
2012
- 2012-12-08 CN CN 201220673449 patent/CN202983501U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103007724A (en) * | 2012-12-08 | 2013-04-03 | 中国航天科技集团公司第六研究院第十一研究所 | Swirl type denitration ejector of circulating fluidized bed |
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Granted publication date: 20130612 |